Help with data fetching

Help with data fetching

Hi
In my application, the user can add new clients while looking at existing clients. Currently I am having trouble with fetching client information from the same form.
I've had a look at these links but I'm not really sure how to implement/use these to make them workable in my application 
https://www.zoho.com/creator/help/script/fetch-records.html
https://www.zoho.com/creator/help/script/fetch-a-value.html

Thanks :)