This bit is really easy.
Create a campaign like normal and choose somewhere in your copy to link to the survey.
When you've done that, highlight the text and click Insert, scroll down and click Survey link...
From there, choose what the link text you'd like to be and select which survey you'd like to link to.
Now your survey is ready to test.
Using the Preview button you can send the campaign to yourself and check how your survey came out.
Please note, your testing won't come through into your reporting.
When you're happy with it all, send!