picture question .. how to remove colores

[HCH Media]

hi i have trouble with removing colors from pics , i tryed my luck with paint.net but they delete too much from the text in the pic .. basicly i need help to remove the green screen so i can use the text for a shirt print .. or if you want to remove it for me i have the 5 pics ready on mega .. need help plz



here the mega links :
https://mega.nz/#!chNlWKzR!pTNqX-NnJ...tAz7dFuD5C0su4
https://mega.nz/#!FptymKjQ!dHzImnwum...ILh9g1h0C7L_vs
https://mega.nz/#!h50wGQZB!_wtE01pRF...MZ4MfDik_E5VkM
https://mega.nz/#!IxUnVBwA!BCWjiG64O...-RJkVxj_FMMyWM
https://mega.nz/#!Ms0VjAZZ!maBq0HTM2...ANNBmvR3lFmhpo