To get to the trail which leads to the Perch, from the parking lot, enter Mussel Rock park. Turn right at the first covert pipe and follow the small footpath as illustrated below.  

When you reach the second covert pipe turn right again and follow the path about 100 feet (ca. 30 m) and you will find the trail entrance marked with orange tape on your left. 

Below is a one-minute video which shows how to get from the parking lot to the trail entrance.