I would like to know if there is a website where I can go to ask questions about the internet. Questions like: How can I delete my posts on a forum? OR: How can I change my IP address? What are some ways that I can go to ask questions or something similar to that?
How can I delete my posts on a forum?
If your question pertains to the use of a specific forum as a web application, you're in the right place on WebApps.
How can I change my IP address?
Questions pertaining to networking, etc. are on-topic on Super User (and a couple of other places, but that's your best bet for everyday things). Something of that nature probably has an answer there already, so do a search before you post. That's a good rule of thumb on any SE site.