Tea light candles should only be burned in their metal cups.
We also recommend putting the tea light cups inside a tea light holder. Regardless if the tea lights cups are in a holder or not, they must be burned on a level and heat resistance surface because the cups become hot when burned.

Burn tea light candles in one session.
Ideally it's best to burn beeswax tea light candles in one lighting.

Keep the wick trimmed to 1/4".
It's important to trim the wick during or immediately after burning your candle. The wick itself becomes potentially fragile when cooled do to the amount of beeswax still remaining in the wick. Trimming a cold wick may break the wick off, making relighting it difficult.

Properly extinguish a beeswax tea light candle.
The easy and smoke free way to extinguish tea light candles is to gently push the wick into the wax pool until the candle is extinguished and then pull the wick straight. Avoid handling the wick after it is cooled as it may break.

Keeping the wick lit.
If your tea light wick has gotten too short try to expose fresh wick by melting the wax around the wick and pouring it off, or warming the wax and gently digging out from around the wick. Once fresh wick is exposed be sure to burn the candle for an hour or more to get the candle back in balance.