1. Adding the required update sites to the Eclipse Update/Add-On Manager
Open Eclipse and navigate to Help->Software Updates...
Switch to the Available Software tab und use the Add Site... Button to the following URL's:
Note that these URL's may change over the time. Have a look at the Eclipse project site of Subversive to get fresh URL's.
2. Selecting and installing the required components
The following components needs to be checked:
Subversive SVN Connectors
Subversive SVN Team Provider
SVNKit 1.3.0 Implementation
Click Install... and restart Eclipse after installation finished.