hey you guys, i'm still a beginner at this!

here's a question... it's still about the 'index.htm' file. if my friend wants to update this site (just the simple headings on the content), and I have a hard time finding the correct 'index.htm' file (there's actually alot of different 'index.htm' files on the host server for this site)... if i'm not sure which one it is, then could i just go to this website online, and select view source from windows explorer, then copy and paste the html onto something like dreamweaver, change what I need to change, then delete the original 'index.htm' file and replace it with the updated file i just did on DW? also, would the content i copied and pasted straight from the 'view source' option be missing anything? i know that i would need to rename the file to index.htm, or whichever file it is... right?

i guess in the beginning i should backup that original index.htm file in case i mess anything up i can just replace it with the first... right?

let me know if any of this sounds confusing and doesn't make sense...

thanks!!!