There are any number of widgets which will accomplish this. On the other hand, if you know just enough HTML, you can either create a page with this, or drop the appropriate HTML into a text widget, and then the contact info will appear on every post.
I think the point that Kim meant is that it’s generally a good idea to provide a link to your website when asking for support. That way we can take a look at the actual website instead of just guessing what you want to achieve.
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