Welcome to WebmasterWorld Guest from 188.8.131.52
Forum Moderators: werty
Click "New Ad" or whatever it sais
When u get to the ad editing screen look under the long description field and find the "destination URL" field with a small ">" to it's left like so: "> Destination URL"
Click the little ">" and the field will open up.
Regarding the login problem - just remove your cookies, cache and all temporary files from the browse. After making sure u have the right login and pass, try to login. if won't work - contact CS :)
Cheers, good luck!