I have Microsoft office publisher and on it you can make 4 postcards on an 8 1/2" by 11" paper then you cut it into 4 pieces. I did this when I was making recipe cards....you would just upload your image and print.
I printed on tag...don't know if you are supposed to but I did.
If you do not have this program I would use your word processing program and make 2 columns....place your logo where you want it in the columns and then cut. I am not, so very not, computer literate, but that is how I would do it. Hope any of this made sense.
Someone else may have a better idea that they will share.