Sharepoint - Retract/Remove Solution - SharePoint 2010

Central Admin - System Settings - Manage Farm Solutions, pick your wsp and hit Retract, then Remove once it's done.

Using STSADM

1. Open command prompt and navigate to C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\14\BIN

2. Use the stsadm command stsadm -o retractsolution -name solutionName.wsp -immediate

3. and then remove the wsp stsadm -o deletesolution -name solutionName.wsp

Using Powershell

1. Go to All Programs => Microsoft SharePoint 2010 Products =>SharePoint 2010 Management Shell =>Run as administrator

2. Uninstall-SPSolution -identity "solutionName.wsp"

3. Remove-SPSolution -identity "solutionName.wsp"