How can I copy all my iPhoto Album to an external HD to free up space for on my Mac

To move your Photos 3.0 library to an external drive, follow the instructions in this support document:

Move your Photos library to save space on your Mac - Apple Support

The main points are -

• Make a current backup of your Mac, before you move the library, just to be safe.
• The file system format of the external drive should be MacOS Extended (Journaled) and not case-sensitive.
• Once the drive has the correct file system format, drag the library to the external drive.
• Double click it in the new location to open it in Photos and test it thoroughly, before you delete the library from your system drive.
• The drive should always be connected, before you launch Photos.

Depends

You can export the photos to the EHD adn delete them from iPhoto losing the edit history

Or you Can run your iPhoto Library on an external drive with no loss of capability but the EHD must always be available prior to launching iPhoto

What exactly is it you ae looking for -- and what version of iPhoto and of the OS are you using?

LN

iPhoto is version 3.0

That's not iPhoto, it's the newer Photos.app.

I am trying to copy my Photo Album in the iPhoto Library to an EHD

These terms are vague. What do you mean by "your Photo Album"? Is this somehow separate from the rest of the Library? Or do you want the Library moved?

I'll ask that this is moved to the correct forum.