There's no problem with saying 'hey look at this other thing over here' but there is an issue with it being the only thing you do here. 
Now I know the guild just restarted so you could have been here years for all I know, I don't recognize the username but just refrain from blatant advertising. If you get to know people here and ask them to join your site of course we promote that. Just don't put yourself out as an advertiser. You'll get a bad name with other members.