From David Fisher,
Your Guide to Candle & Soap Making.
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Once the gel has reached about 200-210 degrees, keep stirring until it is completely melted. Once it's all melted, add your color. I like to use liquid candle dyes because they stay clear in the gel. But you only need a little teeny tiny bit! To this gel (which was a pale yellow to begin with), I added one tiny drop of orange candle dye. If in doubt, dip the tip of a toothpick into the dye, and stir it into the gel that way...tiny bit by bit.

Stir well and add your fragrance oil. While there are indeed beer fragrance oils, I generally either scent my beer candles with some sort of spice or citrus scent...or leave them unscented. Be sure that your fragrance oil is non-polar! How to test your fragrance oil for polarity.