Google will occasionally ask you to verify your site ownership in order to use certain Google services. They have a nice guide explaining this over at https://support.google.com/webmasters/answer/35179?hl=en for your reference.
In order to add Google Verification to your site, we would recommend making use of the HTML TAG method which requires you to add in a snippet of code into the <head> of your home page. They will provide you with the following code along with a specific string of digits.
<meta name="google-site-verification" content="String_we_ask_for">
Simply copy this code they provide and go to your PageCloud site's home page in edit mode. Click the page tab within the editing palette
Then click the <head> button to open up the <head> editor.
Paste the code within the <head> editor just before the closing </head> tag like so:
Hit SAVE&CLOSE and then save your page.
You may then need to complete the verification on Google's end which will detect this code on your site.