How do I find the question I asked?

For future posts, you find your posts by using "My Subscriptions" under your avatar in the upper right of this page. Example:

That leads to a page that shows your activity, but click the "Filter" button to start:

That view defaults to "Following" but you have to manually use the Recent Activity filter to change that to "Authored."

Click on this link.

Delete and reinstall - Apple Community

I tried to do this and could not find any of the questions I authored