This link might be helpful
Do you have a "panel" (probably cpanel) that you log into through Bluehost? You might be able to change the permissions there without using the command line. For example, if you navigate through your file structure to the "wp-content" folder, there is probably a "Change permissions" option somewhere, maybe available by right-clicking/ctrl clicking on the folder.
As you can see in the link above, 755 is a code that is equivalent to these permissions:
user - read, write, execute
group - read, execute
world - read, execute
Hope that makes sense. I wasn't too sure about that bit myself, so hopefully someone will let me know if I'm misunderstanding.