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The easiest way to do this is to hold the reel the same way you would if you were actually fishing. Turn the wheel at least 2 to 3 times to determine if the reel turns clockwise or counterclockwise. This is the way the line will be spooled onto the reel; the opposite direction is the way the line will peel off the spool when you cast.  Spinning reels are designed to hang down from the rod, not rest above it like spincasting and baitcasting reels are. To hold the reel properly when it’s not mounted on the rod, wrap the fingers of your casting hand around the mounting bar and let the reel hang from that hand while reeling with your other hand. The bail is a little wire handle that flips up and down to open and close it. Flip the bail up to open it and down to close it when you’re finished. If you notice any old fishing line on your spool, you should remove it at this time. The guides are a series of small circles that line the bottom of the rod and keep the line in place. Use an arbor knot to secure the line to the spool. Cut any extra line with line cutters, and make sure that you leave at least a 1⁄4 in (0.64 cm) of additional line from where you tied the knot.  You can also use scissors to cut the line. To tie an arbor knot, wrap the line around the arbor and tie an overhead knot in the standing line. Tie a second overhead knot in the tag end, just about 1 in (2.5 cm) from the first overhead knot. Pull the standing line to slide the first knot down to the spool and slide the second knot down to the first.

Summary:
Determine if the reel turns clockwise or counterclockwise. Open the bail by flipping the small handle up. String your line straight through the guides and secure it.