In Google Contact, how do I add contacts to the "SimpleCRM" group?

If you want to transfer your contacts located in Google Contact to Simple CRM, you must attach your contacts to the "Simple CRM" group.

For that:

open your GMail mailbox then open Google Contact

in Google Contact, in the left menu, click on "All contacts

move your mouse over one of the contacts, a check box appears on the left, check this box

Once the box is checked, a menu appears at the top of the page, click on it, and click on "Select all".

the top menu is still visible, to the right, click on the "Group" icon

tick the "SimpleCRM" group

Once done, you can now start synchronization with Google Contact (see http://www.simple-crm-support.com/2014/01/comment-synchronisez-simple-crm-avec-un.html)