help me

hello and Namaste
its just a quick question i have a wordpress site and i really would like to use your plugin and i fear that i may mess up with my site in any case — i have done it once and wont be able to handle the next ,,, thing is i dont really know how to check my PHP ..
Below is my site – could you please have a look and adivce
please
https://www.nepalpyramids.com/