Logging out of router home page

[#1]

This probably sounds really stupid. Logging out normally requires logging out somewhere physically. I don't see anywhere to do this when logging onto the router. Am I being really really thick

[#2]

I don't use the Plusnet supplied router but my Asus RT-N56U router certainly has a log out facility, not that I ever bother to use it.

[#3]

It is a missing Feature of the plusnet firmware I would guess, if you mean the TG582n.  Version 8.4.4.J only has switch user but you aren't logged out.  So it has a login page that has a temporary cookie for security so we have to manually type the login each time but we can't logout.
So if I leave my pc for 5 minutes after logging in to the router, anything could happen if a family member decided to play around.  Not tested it but think it stores that I am logged in cookie for 10 minutes,  so a 10 minute window of opportunity.

[#4]

Yes, you can't logout, just close the window. Even that doesn't log you out but after a period of inactivity the session cookie expires and users have to login again.

[#5]

How about deleting the cookie, that should log you out (if it really is cookie based). 

[#6]

Try closing the browser and then re-opening it, and see if you can get straight back in without a login!