Value Display (the field on the right) displays the value, or position in space, of a highlighted key. This is an editable field. You can enter a new number or expression to change the value of selected keys.

Key Entry toolbar with Value Display field outlined
To move an object in space using Value Display:
The Value Display shows the X, Y, or Z Position key spatial value.
. The new value takes effect. If the time slider is at or near the same frame as the key, the change is visible in the viewports.
Example: To add 10 to the values of specific keys:
Each key's value is incremented by 10. Simply entering 10 would give each key a value of 10.