how to delete songs which had received from an application named share it

i have received some songs from android phone to iPhone 6 through an application named share it.I can't see those songs in music,but I can see these songs in share it application,even I can play it!! now I wanna delete those songs because these songs took 5gb of disk space! and we all know how important iPhones memory is ?? so help me out in deleting songs and make some memory free !!