w do I know where to submit my bid?

You are here:

Depending on the project, it will vary. Some projects will have a web-based online bidding platform. In those cases, there will be a link to click on that is located under Project Details -> Submit Bids To

If there is not a link listed there, most likely the instructions on how to submit your bid will be located in the tender documents located under Documents & Addendas

Previous How can I share a project quickly with someone?
Next Where do I go to view addendas?