Homegroup

Ok, i don't know if this thread already exists, i did tryed finding it thou but here is my problem:

i left the homegroup on both of my pcs(both win 8) and i dont have password, can i just delete it somehow or create a new one-tryed but when i enter change pc settings/homegroup there is no create new button, just space for old password. pls help

high this might help
first image click on joined ,second image ,click on change password ,then i think you should be able to go to other computer an join the home group using the new password

edit images are mixed up ,not in order i firs said .,