Help!!!

my daughter is 5days old..she had a tongue tie but it was corrected., she tries latching on to feed but nothing enters her mouth..now my supply came in full..am in pains..she is hungry but can't latch on well..for the first time I pumped today but what I got just wasn't enough..she just finished it once..

and then I have entered glow and saw a freezer full of supply and my eyes became full of tears cos I couldn't even produce much for my daughter..

Help me mums, how do I pump? how do I produce more? my breast is still full but its not coming out..how do y'all express all out?? please help!!!