1.From Setup, enter Tabs in the Quick Find box, then select Tabs.

2.Click New in the Visualforce Tabs related list.

3.Select the Visualforce page to display in the custom tab.

4.Enter a label to display on the tab.

5.Click the Tab Style lookup icon to display the Tab Style Selector.
If a tab style is already in use, a number enclosed in brackets [] appears next to the tab      style name. Hover your mouse over the style name to view the tabs that use the style. Click Hide styles which are used on other tabs to filter this list.

6.Click a tab style to select the color scheme and icon for the custom tab.
Optionally, click Create your own style on the Tab Style Selector dialog to create a custom tab style if your org has access to the Documents tab. To create your own tab style:
       1. Click the Color lookup icon to display the color selection dialog and click a color to select it.
        2.Click Insert an Image, select the document folder, and select the image you want to use.
Alternatively, click Search in Documents, enter a search term, and click Go! to find a document file name that includes your search term.
        3.Select a file and click OK. The New Custom Tab wizard reappears.

7.Optionally, select the Salesforce Classic Mobile Ready checkbox to indicate that the Visualforce page displays and functions properly in the Salesforce Classic Mobile app.
Selecting the checkbox adds the tab to the list of available tabs for your Salesforce Classic Mobile configurations. Before mobilizing a Visualforce tab, review the Salesforce Classic Mobile tab considerations to ensure that the Visualforce pages in your tabs are compatible with mobile browsers.

8.Optionally, choose a custom link to use as the introductory splash page when users initially click the tab. Splash pages don’t display in the Salesforce Classic Mobile app. Avoid using a splash page if you plan to mobilize this tab.

9.Enter a description of the tab, if desired, and click Next.

10.Choose the user profiles for which the new custom tab will be available.

11.Specify the custom apps that should include the new tab.

12.Select Append tab to users' existing personal customizations to add the tab to your users’ customized display settings if they have customized their personal display.

13.Click Save.