Using this tumbler is easy. Just open the lid, pour your favorite hot or cold drink, and close the lid. You can use the handle for a comfortable grip and the straw for sipping. When it comes to cleaning, simply use warm soapy water and a soft sponge to wipe the inside and outside. Avoid using abrasive cleaners as they may scratch the tumbler. For maintenance, store it in a dry place. If you want to change the stickers, gently peel off the old ones and apply new UV DTF stickers. Make sure not to expose the tumbler to extreme temperatures for a long time as it may affect its performance.