how to add URi scheme to custom fields and fields?

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hi how do i do this?

i want some fields such as email, call, phone to launch a default program.

thanks

thank you

let me clarify my question.

if want the telephone number, email and others to be clickable. When launched the appropriate program will be called.

such as

This email address is being protected from spambots. You need JavaScript enabled to view it.

thanks