The field is asking for "MB" -- thats what the "MB" next to the field means.
The "You may use decimal places, such as 0.5, to specify half of a MegaByte" part means that you can use 0.5 to specify a half of a MB in that field.
"1 MB = 1,048,576 Bytes" means that we are using a 1024 base to determine what a byte is. Currently in the "tech vs math" world, there is a "back and forth" over what "Kilo" actually means. Some are saying that its based on multiples of "1,000" and others are saying its based on multiples of "1,024." This all depends on measurements and storage capacities. You can google these discussions. My intent of showing that "1 MB = 1,048,576 Bytes" in the example, was to so what base the software was using. That base is used all over the UBBT software, well before I ever touched it. (ot: much much prior to that, I came from kermit & z-modem transfer protocols in telegard & wwiv with a 1200baud modem.)
https://en.wikipedia.org/wiki/Megabyte
