You asked me both per PM on xf.com and here, please avoid duplicates.
No you can't do what you are trying to achieve.
The first one is to set a percentage per currency and the second one is to set a minimum price for items put for sale.
Will not answer on xf.com PM further to...
That's because you didn't copy the PPConfiguration.php.txt file but moved and renamed it in order to configure paypal.
Just put back a PPConfiguration.php.txt file in the stated location.
For further support please open separate thread, marking this one as resolved.