Registration emails going to junk. Sendgrid setup?

Hi,

I am trying to stop new user registration emails from going to junk/spam folders. It seems the simplest way was to use SMTP, but my host does not allow it as I am a Hosting Reseller.

I have read through this forum and everyone is suggesting Sendgrid as a way to get around this problem and that it is easy to set up.

I have installed the plugin and created an account and that’s as far as I get. It appears to be far from easy to set up. I do not know what to do next and the Sendgrid documentation does not make it obvious what I need to do.

Can anybody on here, with knowledge of Sendgrid, please explain to me what I need to do please ? I think this would be useful for many people who have similar problem with their emails.

Cheers, Louise