Allow it to sit for 5-minutes (or up to 30-minutes) to gel-up and become an egg white consistency.
Use in baking recipes. One flax egg = one regular egg.
If preferred, simply place flaxseed or flax meal in blender with water and blend. Stop to scrape down sides blend another few seconds. This makes the flax egg very thick and smooth, and it eliminates the need for allowing it it sit. The egg can instead be used immediately in baking.
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Notes
Detailed instructions, in-process photos, and my personal helpful tips can be found in the article above. Flax eggs can usually be substituted in recipes calling for regular eggs at a 1:1 ratio. That means, if a recipe calls for 1 egg, you could use one flax egg as a replacement. This works in recipes for: