May I ask how to use it?

[zoushucai]

I looked at the document and felt that it wasn't very detailed, especially for me, a network novice. The first problem I encountered was that I couldn't log in, as shown below:

Oops! Something went wrong during a cross-origin request. Please reload the page and try again.

Can you help me solve it?

[qwani]

same here im using shared hosting and the admin reluctantly installed docker
the coomands are not clear for me too