If your campaign has already started to raise funds and you'd like to switch your funding options to direct funding, you can still make those changes in your organization settings under manage funding options. This can be found under your settings (the gear icon in the left menu). Once you’ve clicked manage funding options, this helpful article that will walk you through the remaining steps for setting up direct funding: How to setup direct funding.
Good to Know: Any funds collected prior to setting up direct funding are collected using the deferred funding option. This means they were collected by RallyUp for payment at the conclusion of your campaign. To receive those funds when your campaign has ended, you'll follow the instructions provided in this help article: Withdraw and send funds to your organization.
Here are some other articles that you might find helpful!
Direct and Deferred Funding: What’s the difference