>>/29747/
You don't need an account to post on Endchan, it's an anonymous imageboard. Namefagging can be done with tripcodes, see ?help.
You need an account if you want to open a board, or want to become a volunteer on a board or the site. That's about it.
>>/29748/
Click on the eye at the start of the thread header (just after the checkbox), then open the watched threads in the navbar on top.