To customize the names on Gainsight tabs:
- Go to Setup > Tabs > Visualforce Tabs > New
- In the dropdown "Visualforce Page" select the page that you would like to target (The Gainsight tab is named "HomePage [JBCXM_HomePage]"
- Name your new tab, select a tab style, press next
- Select the layouts to add it to, Save
- Now, you can click the + on your menu bar, then "customize my tabs" to add it, remove other tabs, and reorganize your tab order.