[ez]

The shuttle can't reach the geostationary satellites to repair or do anything with them. It can only reach stuff in low orbit.

Then how do they get there?

[from occupied ga]

Then how do they get there?

Rockets other than the shuttle of course. Those that were taken to low earth orbit by the shuttle were then sent on their way with additional rockets. The shuttle can't reach geostationary orbit, and if by some combination of staging with multiple boosters did get there it couldn't get back. Shuttle is strictly low earth orbit.