How can i do it?

A great place to do that is imgflip.com/m/SponsorStreamsHere (BTW I own this stream)

You just made the stream recently and not popular so you have to sponsor it in another stream, like imgflip stream?

And also there is a specific stream created by the owners of imgflip at the testing site: to join the testing site you must comment on imgflip.com/i/970jtb

You lead me to a wrong link, Mr.imgflipper

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