What is the process of going to USMA as a current soldier?

https://www.usma.edu/admissions/sitepages/faq_soldiers.aspx. If this is what you want, get into it and get after it.

If I understand your question correctly. To attend West Point Prep school you have to develop a packet and have the support/recommendation of your senior COC at the nominative level. Your S1 can provide you with the requirements specific to your packet. It also helps to have a Federal officials nomination, home town Senator or Congressman. Thank you for your service.

SPC (Join to see) Here are a couple of links with information:

http://www.ncosupport.com/education/enlisted-west-point-admissions.html

https://www.goarmy.com/careers-and-jobs/become-an-officer/how-to-become-an-officer-in-the-army/us-military-academy.html

As LTC Mackay said, go straight to the USMA admissions website and read the information. Short answer, you have to apply to West Point. You cannot apply directly to the prep school, but will be considered if your application is not competitive enough to receive an appointment directly to USMA. Keep in mind you must be under 22 the year you enter the academy, therefore under 21 the year you would enter the prep school if that was the case.
If you're serious about this, start by taking the SAT/ACT if you have not, and remember you will need the support of your chain of command. Completion of college classes would be a plus as well. As someone who recently went through this process, I may be able to answer any more specific questions you have.

https://www.military.com/education/timesaving-programs/defense-activity-for-non-traditional-education-support-dantes.html

Call them if you haven't already, and get your military strand riot, get unofficial copy, as well as official copies pre-enveloped as well, of shoildmbe possible, I don't know how they do the transcripts, you'd need to ask....

http://www.uopeople.edu

Thus isn't regionally accredited, it's not a panacea, I'm unsure if the svcs, VA, or industry accept them, there's no tuition, just admin and exam costs prorated bumper capita income in a given country they were recently endorsedmby the Vatican, they've got assocs amdmbachs in bus admin, comp sci (CS), and health DCI, as well as an MBS, however you'd realpymneed to ask to see of they'd benOK, I only !mention them for the low costz dontmtakemitmon faithz ask, OK? Their ofcs are in Calif....

https://en.wikipedia.org/wiki/Community_College_of_the_Air_Force

This may not be open to other svcs than USAF, also, you hadn't listed your MOS, however, of read about efforts to open it to other svcs, I'm sure they field questions from other svcs, I've been told on here that one needs a valid fully qualified USAF AFSC, the equiv of an Army MOS, howevermyou might ask....

http://www.chartteroak.edu

I'm reZ-sending that one, typo....

http://www.cjarteroak.edu

This is a CT state version of the other two, also real....

http://www.excelsior.edu

This was part of NYS govt, it privatized, very SVC friendly, very well regarded, regionally accredited, I got a 2nd Bach in math with them, a friend got his Bach in !ath, and went Navy OCS using it, that I know for sure, trust me, call them, OK?