Okay, feel free to ask. (but in a separate thread, please)
Select from the menu File / Export / GeoTiff.
Beforehand you probably want to convert the reflectance bands, because SNAP saves the raw data in GeoTiff. The simplest way is to use the Raster / Band Maths from the menu.
For each band create a new one and use as expression the name of the old band. Ensure that the data is stored and not only the expression (mark the checkbox). Afterwards you can delete the old band.
You can also apply the conversion from raw to geophysical data afterwards. For doing this you need to look up the offset and scaling factor (Information Dialog of the band). Those values differ depending on the Processing Baseline. It has changed January 2022.