For PM: People icon > Public (or friend list) > Search name > Doubleclick name
Adding friends: People icon > Public (or friend list) > Search name > + icon
Ignoring: People icon > Public (or friend list) > Search name > Block sign (don't forget to report if spamming)
.
.
Seeing binder: Trade > New Private Trade > TYPE in name > Public tab (stops lag from list being loaded this way)
Don't forget to uncheck 'Like for Like' trading at your portion and diable "Show Cards I Want".
.
I have the answers for you at ptcgo.wikia.com :)