The proper way to replace the broken cv boot is to take the transaxial out, break the clamps,separate the joint, put the new rubber boot in.
There are some products that the boot is split or in 2 halves.
To replace it- just break the old one and glue the 2 halves together in place, follow by tighten the clamps.
The latter is very convenient but will not last long and personally, I don't recommend that.