How do I take an EA created for me from my MQL5 site to a demo account to check it out?

 
How do I take an EA created for me from my MQL5 site to a demo account to check out how it's actually functioning?  I've never done this before.
 

Use the following links to find the information about autotrading and strategy testing (and about how to open the accounts) - 

 
Thanks but the information I need is not there!
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