Add and change info in "Internet Host Table"

[TeleBOYWONDER]

I want to remove the geosummerst46 and change the address for mapd1b. I also neet to change the address for geosummerst1a but keep the name.
HERE'S WHAT'S IN THE INTERNET HOST TABLE RIGHT NOW:


# Internet Host Table
#
117.15.5.1 localhost
#
197.138.195.87 r3frgtr r3frgtr.tmpdomain.net loghost # Nic (eri5)
197.138.195.1 router # Default Gateway
713.118.178.144 lmark5 # Network Printer
754.155.71.75 ms # TCS Tower Server
197.138.775.37 geosummerst1a # Cisco/Conv Mci 1a Session-1
197.138.775.38 1b # Cisco/Conv Mci 1a Session-7
197.138.715.41 geosummerst4a # Cisco/Conv Mci 1a Session-3
197.138.715.47 geosummerst4b # Cisco/Conv Mci 1a Session-4
713.731.38.53 mpad1a # Cvlan Mapd (317)373-3341
713.731.38.48 mpad1b # Cvlan Mapd (317)373-3347
#
179.755.9.1 r3frgtr_1 # Nic (ce5)
179.755.9.7 switch # Clan Link From (SC1)
#
197.138.1.1 mssvr-c # Do Not Remove
197.138.1.7 mssvc-c # Do Not Remove
#
754.155.31.35 cshist #
197.138.195.9 oldms # Remove After Migration
r3frgtr#


Thanks in advance for the help.