1.Start STS, then select Help > Install New Software... In the dialog that appears, enter the update site URL into the Work with text box:
http://downloads.myeclipseide.com/downloads/products/eworkbench/helios/me4s-eclipse
Click on the Add... button.
2.Leave the Name text box empty (the name will be retrieved from the update site). Click OK.
3.Back in the Install dialog, you should see the center box filled with MyEclipse for Spring. Select the checkboxes. This will install the MyEclipse for Spring plugin. Click Next.
4.Review the features that you are about to install. Click Next.
5.Read the license agreements and then select I accept the terms of the license agreements. Click Finish.
6.You will be asked to confirm installation of unsigned content. Click OK.
7.You will then be asked be asked if you would like to restart SpringSource Tool Suite. Click Yes.
8. Now you are ready to start using MyEclipse for Spring. If you encountered issues during the installation, please see the MyEclipse forums.
