How to remove test Submission?

How to remove test Submission?
I am facing this error , snapshot is attached below

Hi @kashan.z,

Just to follow up, what you were seeing was an internal technical bug in our submission system. It should be working properly now.

Did you want to actually remove your submission, or were you just trying to work around the bug?

@brianhelba Thank you so much for your response. System is now working bug free. I saw one post that recommends to remove test submission to avoid this error, that’s why i asked about removing test submission.