I made a boo-boo

OK.. So I should first say I’m completely new to WordPress and anything related to website design, programming, ecommerce or anything in the realm of computer science.
It’s been a huge learning curve so if someone could explain to me what to do like I was a 10 year old.. that’d be amazing.
I bought a theme for my site (called Bazaar Shop which I bought off of Themeforest) and i’ve been fiddling around with it just trying to figure out how to use it. I noticed that there was an update for the theme so i went ahead and updated it..which unfortunately made it so woo-commerce wouldn’t work with it.
I tried to follow the instructions below on how to integrate woocommerce into the theme.. but I seemed to have messed up my site even more.
https://docs.woothemes.com/document/third-party-custom-theme-compatibility/
Now when i try to log onto my site all that I get is this message…
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘woocommerce_price_filter_init’ was given in /home/hangleys/public_html/wp-includes/plugin.php on line 406
Warning: Cannot modify header information – headers already sent by (output started at /home/hangleys/public_html/wp-includes/plugin.php:406) in /home/hangleys/public_html/wp-includes/pluggable.php on line 876
Could someone plllleeasee help me? Thank you so much.