Press the green flag, then press space to enter a description. Then click the background to check if your description is valid. Change sensitivity (higher is more lenient) if you want.
This is made to combat a lot of MuseScore descriptions which copy and paste the dictionary to get more views and to appear in searches. This may be a possible solution, or at least a concept of one, that could be implemented on the website. They could do it with swearing, but I don't think they will.
