With your SecureGive account, you have the ability to use your one login to give to multiple organizations who use SecureGive. Once you've completed a transaction with an organization in SecureGive, they will show up under your My Organizations list.
Once you click on My Organizations, this will take you to a page where you can select from the organizations you've interacted with and this will take you to that organization's account. To add an organization to your account, you can go to their website and follow the give prompts to access their giving page. Once you've given to their organization, you'll then be able to see it saved under your My Organizations page.