Welcome to the forum. We do all try to help and support as much as we can. The back of the arm is the recommended place for application and i've never tried it anywhere else. Use the alcohol wipes and make sure your arm is dry and as others have said, after it has been applied try and hold it in place (i hold mine for about 30 seconds before gently jiggling to get the applicator off. If the adhesive starts to lift after a few days or towards the end of its life, i use a Tegaderm plaster to put over it. It keeps it in place until the sensor runs out.For some comments I am placing the sensor on the right area on the back of my arm, I joined this as I thought it was to help others with the same condition as each other not to be criticised and made out to be stupid seriously considering leaving the group
Any faulty sensors or ones that drop off before the 14 days report to Abbott. They are good about replacing and if they ask you to return it, they send you everything you need to do so.
As i've said, welcome to the forum @JULIE's. Ask any questions you need to, no question is silly and there will always be someone who can answer or point you in the right direction.