Questions about developing a wallet API.

According to the tutorial, the Algorand node of Ubuntu 18.04 is arranged. The block has been synchronized, and the following prompt appears on the API link (8080 port is open). One of the uses is to develop a wallet. Is this a problem, or what command do I need to run? Thank you!

can you paste in your code? Is this a web app? What tutorial are you referring too?