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After restart the eclipse, It will prompt you to select Connectors to install. I installed SVNKIT 1.1.7 1.2.2 1.3.0
Reference: twm-kd
SVN Support for Eclipse Helios on Debian Squeeze
If you have trouble to install SVN support for Eclipse Helios on Debian Squeeze, this page may help you.
Basically in a fresh Helios install I first installed the Subversive SVN Team Provider from the early access location which as of 2011-01-19 was:
No Format http://download.eclipse.org/technology/subversive/0.7/update -site/(This is as opposed to installing it from the Helios update site, which did NOT work.)