dpi = dots per inch, which is controlled by your printer
ppi = pixels per inch, which is a resolution value, and can be adjusted in PSE.
When you go to Image>resize>image size, in the dialog that opens, enter a value for H & W, and a value in the resolution field in px/in' For printing, the rule of thumb is 240-300px/in range. For web work, 72 px/in is ok. Check "Constrain Proportions & Resample."
You don't state the type of printer that you are using, but look in the printer properties to see if you can adjust dpi.
As to the fuzzy text, make sure that the layer opacity is 100% for the text layer. Also consider using a blocky font.