The way you have added your script obviously means its called when ever the user logs in, so the only option now would be to use another Linux computer to access your SD card and remove the script.
You could do this using your pi if you have another SD card and a card reader that works with the pi.
install raspbian Jessie on spare SD card and boot pi, install old SD card in card reader and plug in to pi.
form what you have said looks like you have used noobs to set up card and as I never use noobs I cant advise you as to which partition to look in to fine the correct folder.
We want information… information… information........................no information no help
The use of crystal balls & mind reading are not supported