How-To Use Custom Settings & What They Do

Colors – Clicking one of the color circles on the Customize page lets you choose the color of the desired element, e.g. changing the Paragraph color changes the body text on all of the posts.

Fonts – Body and Heading font lets you choose the font you would like for your headings and body text.

Toggles – Those lets you choose if a particular function is turned on or off.

Blue means on and grey means off.

Texts – These fields usually require a username for a third-party function like Disqus Commenting and Google Analytics.

Twitter Feed Length in this case takes a number.
Instagram ID Instagram specific user ID you can get it by generate not same with instagram username. Follow Detail