How do I reformat an external hard drive from an IMac 10.4.9?

I am new to Mac, having migrated from PC recently. I just purchased a new external hard drive but it is formated as NTFS (read only) and I need to reformat it as FAT 32. Does anyone know how to perform this reformat from my new IMac? Sorry, but I am totally new to Mac and I need all the help I can get. Your assistance will be greatly appreciated. Thanking you in advance.
IMac   Mac OS X (10.4.9)  

Hi rubenrodz;
May I welcome you to the Apple Discussion Forums.
Just be aware that while FAT32 can be used for both the Mac and the PC, it does have limitations. You can't have files larger then 4 GB. Plus FAT32 doesn't keep all of the Mac files.
If you are only going to use the disk on the Mac if would be better to format it as HFS+, the native Mac format.
Allan

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