I would like to replace or change my PC's processor from Intel core i3-7100U with i7 or above. Is it possible to get changed? If yes, please let me know the complete process how to do required changes.
You must ask the manufacturer of your device what processors are compatible with THEIR Bios. Then, you can select from those processors.
An upgrade processor must be socket, chipset, and bios compatible.
And, this is only possible if your processor is not solderd to the board, which yours is. So, you can abandon this effort now.