How do u format a transcend micro sd

If you are using it in a phone then the phone's file manager has the option to format the memory disk. And if you are using it with a PC then insert the card in an adapter that you must have received with it, and insert it in the card reader of the PC. It will be shown ad another drive in My Computer. Right click on the drive and select Properties. There you will find an option of formatting it. Select this option.