A special stretch stitch is not required to sew stretchy fabric. All one needs is a zig-zag that is wide enough and close together enough to allow the fabric to stretch without breaking the stitching thread. (Test it on a piece of scrap fabric you are using, give it a good tug and see if the thread breaks.)
NOTE: be sure to use a ball-point needle. A sharp needle will tend to cut the fabric threads and your stretch fabric will eventually develop holes and runs commonly found in knits.
There doesn't appear to be a manual for your machine, however, you can usually find a manual close to your machine model and the instructions will be similar enough to suffice. Perhaps you will find one with instructions for sewing stretch fabric:
ELNA Other manuals
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