How to install intermediate/chain certificate?

My website URL is: overloadromania.ml

What I’m seeing is:
Facebook Debug:
-SSL Error: Can’t validate SSL Certificate. Either it is self-signed (which will cause browser warnings) or it is invalid.
SSL Report:
This is what i get in the SSL Report:
-This server’s certificate chain is incomplete. Grade capped to B.

I’m using this software: Web browser

Additional information: I got a chain certificate but i don’t know what to do with it.

You cannot use the chain. Just simply treat like any other ssl certificate and most browser will work fine without the CA chain.
InfinityFree says here how to get it to work.

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Support for intermediate certificates/CA chains is only available on premium hosting. Most browsers will work just fine without these additional certificates.

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