If you haven't already, learn how to Install the SFDC Gallery App and Setup Within An SFDC Contact, Lead, Or Opportunity before instructing SFDC users to add as a personal tab.
Add The Gallery App As A Personal Tab
1. When accessing your Salesforce Instance, in the top navigation menu select the + menu option and then select Customize My Tabs.
2. Select Kapost Gallery from the Available Tabs and Add it to the Selected Tabs.
3. Select Save once Kapost Gallery appears within Selected Tabs.
4. The Kapost Gallery will now appear as its own Tab within the Salesforce Instance.