Amend entered values

At the moment, one cannot amend values by jumping cursor or jumping to a specific value for the sake of amendment. Rather one has to overwrite the whole amount.

For e.g. if I need to amend $100.67 to $200.67; I will need to erase all values and re-type, instead of being able to simply jump my cursor to the required replace. In this example only digit "1" needs to be replace "2" for achieving $200.67 but I can't (currently it will only be done by overwrite).