How can I login to a different account?

On the top right corner at https://snip.ly you'll see a link to log out. Once you log out, you can log back into another account.

If you use X login, there's a chance that it'll keep logging you back into the same account without giving you the option to log in to a different account. This is likely because you're logged into X in a different tab. All you need to do is go to https://x.com and make sure you log out of there, then Sniply should let you log in to a different account. Likewise, with Facebook, you may have to visit https://facebook.com and make sure you log out of that account.

If you use Email login, there should be no problems.