First, make sure that you have purchased one of our supported label sheets for your printer.
For rectangular label format: http://www.onlinelabels.com/products/OL1000WX.htm
For jewelry label format: http://www.onlinelabels.com/OL6925.htm
To print barcodes from the Epson TM-L90: Click Here
Also, printing correctly can depend on your operating system's application. On Windows 8 or above, it's difficult to print with the included Adobe Reader. The version of Adobe to pull up the label pages correctly is 11.0.11 . To get this recent version of the Adobe Reader, please click on this link : Adobe 11.0.11 Download
When you have the label page up in Adobe, you'll want to check the settings. Alignment issues can be resolved by trying the following things on the print dialog:
Step 1 : Set the page size to "Actual" and not "Fit"
If #1 doesn't resolve the issue then also try the following:
Step 2 : Set the paper size to A4