In Need of Assistance

Could someone please, please, slowly and carefully--using simple words--walk me through how to install the "follow me on pinterest" button onto my blog.  I cannot figure out how to do this and I would really like to have a follow me button.  I try to copy and paste, but blogger tells me that the gadget is broken.  So today I wrote down the address and tried to put that in and it still told me that it was broken.  Obviously, I am not doing something right...