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However, as a rule of thumb, set the blade to widest setting, then test serge and tighten up the top and bottom looper threads to encase the cut edge neatly. So you would need to turn the dials on the two right hand knobs to a higher number, just move each dial one number at a time and test serge again.
The other possibility is that the thread is not between the tension discs properly, so check your thread paths, when you pull on the thread below the tension dial, it should feel firm to pull.
I always test serge scraps when sewing a new fabric and adjust the tensions to suit it before beginning a new project as a lightweight fabric will behave differently to a heavy fabric.
If you mean the threads get tangled behind the presser foot then maybe this can help. Try pulling the threads gently as you guide the fabric through the first time. Also, I sometimes put a scrap piece of fabric under the presser foot with the edge lined up with the needles (so it is further back than normal). Then I gently press the speed control foot and pull on the threads. This allows the needles to start sewing right away on the fabric rather than giving the thread a chance to get tangled. Hope that helps!