20 Most Recent Fossil Chronograph FS4249 Watch for Men Questions & Answers

Go to a watchmaker/technician. They will have a press that they can use to apply even pressure putting the crystal back in place. Be careful that you do not lose the teflon seal sitting where the crystal goes and do not let any dirt or contaminants get to the face of the watch. Be sure you ask them to pressure test it to be sure it is water resistant.

Take it to a watch store and they will do it for you

Try http://www.watchstation.com/webapp/wcs/stores/servlet/ContentView?langId=-1&storeId=34054&catalogId=23503&page=customerCare_watchInstructions&nav=leftNav_CustomerCare

Link to Fossil's watch instructions: http://www.fossil.com/wcsstore/CommonFossil/attachments/watch_instructions/Fossil_Watch_Instructions_ENG_UK.pdf