Signatures problem

Hello everyone!
First of all, I'm new here so I moved on with something please lock the topic.

I recently opened a forum and my friend recorded and told me that in order to assign a picture in the signature should be over 7 days registered forum. There is a way to change all the time will be assign images in signatures without being over seven days in a forum? With so explain to me how please, thanks!

General>Forum>Security
Unauthorize members with less than a week registration to post external links and emails :No
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See if that helps.

Thank you!
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