I just want to add a coupe of details to Steve Puluka's answer,
It will be recommended to copy the file to /var/tmp
then the next 2 steps are fine,
enter to config mode (> edit)
run "delete" to delete the whole config
But in order to load the config the command will be "load set" no need for that initial "request"
# load set /var/tmp/config.txt
Also I would like to add that you can run this command "show configuration | display set | no-more" and either log the session or copy and paste the output to a text editor to quickly get the config file without using filezilla
Reagards