Unless you have problems getting to photobucket when you type photobucket.com in the address bar, that won’t solve any problems. That command clears your local domain name service cache on your computer.
DNS stands for Domain Name Service, which is the internet protocol for resolving a website’s name to the numeric i.p. address that your computer can use.
It would fix a problem where they numeric address for photobucket had changed, but your computer was still looking at the old address. A big site like Photobucket has many different servers at different ip addresses.
The command they gave you shouldn’t hurt anything, but I’m not sure it will solve the problem. You can get a terminal in the applications/utilities/ folder. That’s where you learn that OSX is just a pretty graphical shell for BSD unix.
Thanks for the course in computer terms. I’ll get to the Photobucket fix soon as possible.
If you are using Safari as your browser on your Max OS X, go to the word "Safari" at the upper left of the toolbar, just next to the blue Apple logo. Click on it and a menu will drop down. Scroll down to "Empty cache" and click on it. A box will ask you if you want to empty the cache, and click "Empty." That's all there is to it.
This step clears out any old IP addresses.
Then re-enter "http://www.photobucket.com" to go to Photobucket, and see if those steps have fixed the problem.