Odd pages and their respective functions


I have 3 pages which functionality I'm confused about:
1-A /register page with the following in the text panel:
[ms-note type="info"]We have the following subscriptions available for our store. To join, simply click on the Sign Up button and then complete the registration details.[/ms-note]

2-A /register-2 page with the following shortcode in its text panel (it seeems to have been generated by Theme My Login):

3-A /your-profile page with the same Theme My Login shortcode mentioned above in its text panel.

I'd like to know what they're for, especially the duplicated registration pages. The Register button being displayed at the wp bar redirects to /register, but supposedly the registration should be managed by the page generated by Theme My Login, so I wonder if I should delete /register then remove the "-2" from the /register-2 slug, as this is the registration page generated by Theme My Login.