Welcome the Technical Support section. Help us in assisting you by providing us with a concise and descriptive elaboration of your issues. Be specific and if possible, provide us with a step-by-step instruction in replicating your problem.
For remove the powered link you need upgrade your Jomsocial to the professional edition(we have discount 20%), and every hack CSS will be overrided with the newest code when you do upgrading.
March 21st. - You offer me a discount
March 21st. - I ask how do I apply the discount, since you did not provide me with a promo or coupon code
March 24th. - 3 days later you reply that the discount has expired
To the casual observer it would seem that you waited to reply precisely at the moment when you could simply say "I am sorry the discount already expired last week".