Migrate contacts from zoho books to zoho crm

Migrate contacts from zoho books to zoho crm

We am zoho books users. We want to use crm, we want sync contact from zoho books to zoho crm. We followed your guide https://www.zoho.com/crm/help/zoho-invoice/ already but failed at the step to find "Apps & Add-ons" button in zoho crm (see .jpg attachment). Could you guide us a SIMPLE + CLEARER WAY, PREFERABLY PRINT-SCREEN STEP-BY-STEP to help us finish this process?