You will only be able to embed Google Analytics if you are pointing the page to a custom sub domain, other wise Unbounce will provide you with minimal analytics on the performance of your landing page.

Once it is pointing properly, visit your Google Analytics dashboard:

Step 1: From "Overview: all accounts" click the account with the domain you are pointing to (root domains will capture your subdomain traffic).

Step 2: On the right hand side, next to your domain click "edit"

Step 3: On the top right you will see "Receiving Data (check status), click check status.

Step 4: Copy the script provided

Step 5: Go to your Unbounce and edit the page you will be embedding the script. Click "Scripts JS" on the top right

Step 6: Add a new script under Twitter Anywhere, and label it "Google Analytics". Paste your script and select "Before body end tag"

Step 7: Save the page, and republish it on your landing page dashboard.