Using Import Font from Embroideries
"How do I create an apostrophe or quotes?"
If your set of letters includes a comma, load it as the apostrophe, then move the Baseline so that it is on or just below the red dashed top line. For quotes, copy and flip the comma before loading as single and double quotes.
You can also use mySewnet™ Stitch Editor to add accents to existing characters, and create other punctuation symbols.
"My apostrophe overlaps another letter when placed as lettering."
When loading letters for a font, the apostrophe and quotes may kern better if they are placed further down from the red dashed top line.
Alternatively, use Horizontal Block with the Individual option to be able to fully adjust the lettering after placing it in the work area.