Yes, it is possible. However, what I see in other topics is that you are doing your own password management rather than using Workgroup security. Not that I blame you for that choice, you understand.
For a beginner, you are being a bit ambitious. I would suggest the following approach.
Build a password change form that contains three text fields with labels "Account Name", "Old Password", "New Password", "New Pwd Verification" All of these fields should be unbound.
Make the foreground and background colors either all black or all white for Old Password, New Password and New Pwd Verification.
If a user enters a valid username, the correct old password, and matching values for new password and new password verification, enable a button that says "Update" or "Commit" or something like that. When you click it, open a recordset to your password table where the criterion is
"Account Name" = """ & [AcctNameOnForm] & """"
(or whatever you called the field on the form.)
Then verify that there is a record, verify that the Old Password was entered correctly, and if the new password and verification match, modify the stored password and do a .Update on the recordset.
Close the recordset when done.
That's it.