I want to contact a member but an error message pops up saying that I have not been given permission to.

Members who registered after March 22nd of last year lack permissions to view profiles.

Unfortunately, this was necessary due to the lowlife scammers who were slithering around this (and many other) forums last year.

In the thread in question, I see that member 12131 advised you on how to deal with this.

You can thank the thieving trash of the world for all of this. I regret that it was necessary to take this action, but, necessary it was.