How to change Docker ports?

I would like to run adguard and openspeedtest on my Synology NAS through Docker. Both use ports 3000 and 3001. Therefore, during the setup of openspeedtest, I changed the ports from 3000/3001 under Port Settings to 9000/9001 respectively. Also, I updated the HTTP/HTTPS port information under Environment respectively. However, when I attempted to go to http://NASipaddress:9000 or https://NASipaddress:9001, nothing came up. So, I tried using port 3000 first and the openspeedtest gui came up. When I tried using port 3001 second and the openspeedtest gui came up. Why is this? Why didn’t 9000 or 9001 work?

nothing came up

What does that mean? Could you connect to the port, did you see an error message, what does browser developer tools network tab tell you?

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