How to add image when adding custom fields

There is a provision for adding custom lines or fields in the various forms, there is also an option to select as line text, paragraph, drop down, image and date.
How do I add image in the customised template

With HTML reference to an external URL. See the Guide: https://guides.manager.io/13392. You cannot reference a location on your own machine. For example:

52%20PM

yields:

04%20PM

@Tut How do i make a image web accessible?

Store it on a server in the internet eg on a cloud server