You need to install and activate BP Template Pack plugin first https://codex.buddypress.org/theme-development/wordpress-to-buddypress-theme/
Download the 6 BP folders transferred to your collection theme in server down to your computer hard drive. Looking at the source codes you’ve posted above, you have to use the first method – changing 16 template files inside those 6 BP folders as noted in codex link above.
Before going into this though, did you know that when viewed at wide screen, your site layout is aligned to the left i.e. not centered in screen? Also, that when your site is viewed at 1024px, the right side drops down under the main content div area?
