Creating a label with a text editor (e.g. gedit) is not supported.
Create a label with OpenOffice
1. Download template file
2. Unzip the template file
3. Run the OpenOffice Writer or OpenOffice SpreadSheet
4. Select the template file by browsing from file->Open
5. Edit the document
6. Open the print menu, select your P-touch/QL-Printer for the Printer destination and click "OK".
Create a label with gimp
1. Open a new file with the image size that suit the label.
2. Edit the image
3. Open the print menu and set the following configuration for your P-touch/QL-Printer.
"Image Settings" Tab -> "Adjust Page Size and Orientation"
*** Media length for continuous tape is about 100mm.
*** Use the paper tool command to add a custom media size longer/shorter than 100mm. Use brpapertool command