i just recently got an LG rumor cellphone

1) my first problem is that i can't put songs on my micro sd card and make them my ringontes

2) my second problem is that i can't put pictures on my micro sd card and make it my backround

so is there any way to get around the phone so i can do this ?
do i need to unlock the phone ?

or any way to trick my phone into thinking my pictures are taken with my phone camera or something ?

any help is appreciated, thanks in advance