Step 1: Using the left hand side menu, click on Settings, then click on Integrations.
Step 2: Across the top you'll see the three Integration options offered: Zapier, Planning Center, and Wordpress Plugin. Click on the one you'd like to integrate.
For Zapier and Planning Center, you'll see a button labeled "Connect". Clicking on this will open the log in screens for each of these. After logging into your accounts, you can begin Integration.
For Wordpress Plug In, click where it says "Download Link" so you can download, install into your Wordpress site, and activate.