You need to make a directory .fonts (the period at the beginning is important) under your home directory and copy the fonts into it.

In case you're not familiar with the Linux command line, here's a way to do it.
1) Save the font files to the folder MyDocs
2) Open the terminal
3) 4) Done! I assumed your fonts have a ttf extension. If it's something else you'll need to replace ttf with the correct extension.

โชคดีนะ