This post provides an overview of how to give someone access to your Google Search Console (Google Webmaster Tools).
Step 1: Open your browser and go to https://www.google.com/webmasters/tools/
Step 2: Next to your site, click on “Manage site” and then select “Add or remove users.”
Step 3: Click “ADD A NEW USER.”
Step 4: In the popup that now appears, enter the gmail address of the user you’d like to add, e.g. firstname.lastname@example.org .
Step 5: Select the permission level that allows the new user to do what you asked them to do and then click “Add.”
For more information on permission levels, please see “Managing users, owners, and permissions” in the Google Search Console Help Forum.