You need to create a Portfolio Page before performing its customization.

Please follow the below steps to create Portfolio Page:

• Go to Pages> Add New
• Enter the Page Title
• Select the Template as Portfolio Page
• Click on Publish

Please follow the below steps to perform portfolio settings:

• Go to Appearance> Customize> Portfolio Page Settings
• Enter the First Label & First Link
• Enter the Second Label & Second Link
• Enter the Portfolio Category Label
• Click on Publish