Wow, those blanket edges are quicker with the slip stitch blade! I have no financial interest in the company, but I sure wish I did. Here are their directions for edging using their tool:
With right side of fleece facing you, single crochet in any hole but corner hole, chain l, single crochet in next hole, chain l. Continue around blanket, working 3 single crochets in corner holes.
A suggested finishing pattern.
1) From the front side of your project, slip-stitch in a back loop of a stitch on the foundation pattern.
2) Skip a loop and work 3 double-crochets in the next loop,
3) Skip a loop and slip-stitch in the next loop.
4) Repeat steps 2 and 3 until you reach the second hole from the corner. Continue the same pattern without skipping any loops until you reach the second hole on the other side of the corner.
Soon time to get busy for Valentine's Day!
5) Then, continue skipping loops as before until you reach the second hole from the next corner.
NOTE – As you finish a round you will probably have to adjust your stitches to make the final joining of the pattern blend in attractively.