It's not as simple as just removing code. You need to redesign the gump to support text input and then re-purpose the player to yank data from a third-party site that may or may not 404. There's a lot more to it. If you have access to the Invision Marketplace, you could always recommend that the author of the newer plugin (TheJackal84) adds the aforementioned support for URLs.
Alternatively, you can post an offer in our Marketplace to commission someone to do the work for you. Be sure to follow the stickied guidelines.