If you think something has already been answered here in the past you can easily direct them to the search page by the click of a button in the editor box. It's a "G" button (for Google, we can change the image if we want).
When you're making a reply to a post you can click the

and it will add [ search ] [ / search ] tags (without spaces) to your post. When you submit the post those search tags will be replaced with the following message:
I believe this question has been answered before, try the Fish Lore Search
You do have to enter at least 1 character before using this button though. It's a posting rule that I can't turn off in the settings. You could say something like "Hi - " then click the

button to add the search tags which gets replaced upon submittal with the text above.