Help me to add this feature for my social media app. A username cannot used more than one and also username only contains letter, number, _, .
Anyone please help me and share your kindness with me 
You can try this.
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Sure! Thanks!!
in that template which data should I need to copy to complete my duplicate username system? (and what is “things” mentioned there) sorry, because I’m new to glide 
The template just provides an example of the techniques that can be used. The specific columns that check for duplicates can be found in the Helper table that the form is attached to:
The idea with the template is that you can study it to see how it works, and then apply similar techniques in your own Apps.
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duplicate check is mentioned from relthings to duplicate only, isn’t it?
The name that the user enters is used in a relation. If that relation is not empty, then a duplicate is found.
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Thanks!!