I am using the following Versions:

Zen Cart Version 1.3.8a
PHP Version 5.6.38

My Provider is discontinuing the above PHP-Version and my Website will
only work in future whe I do upgrade it to PHP Version 7.2


I don't understand anything about how to do this....
may you point me into the right direction?
Please in a way that I am understanding....

Any support would be soooo appreciated.