Most of the characters in a font should sit on the baseline. It is a special red guideline which is fixed in position when the font is created. Quotation marks and other special characters sit above the baseline. When setting the baseline, allow enough space below it for descenders. For instance, the tail on the 'y' character is a descender.
Use Move Guidelines 
to move the Baseline.
In mySewnet™ Embroidery, characters in a word or phrase are placed according to their distance from the baseline. Therefore, use of the baseline should be consistent in a font.
For fonts with a baseline joining point, start every character on the baseline, or at the same height above the baseline, at the extreme left. If required, use a navigation stitch to move to the point where the character begins.
As SuperDesigns do not use a Baseline, altering the Baseline for a SuperDesign set will have no effect.