Installing a module is much like installating a plugin, the steps will seem very similar.

Step 1:

Download the module to your desktop.

Step 2:

Log into your Joomla 2.5 Dashboard.

Step 3:

In the top menu, hover over Extensions and then click Extension Manager

Step 4:

Under Upload Package File, click browse and select the module you downloaded in step 1, then click Upload & Install

When your Joomla 2.5 module has been uploaded and installed successfully, you will see a confirmation message:

Step 5:

At this point we have installed a Joomla 2.5 module, however by default new modules are not enabled, so we'll now enable the module.

In the top menu, hover over Extensions and click Module Manager

Step 6:

Use the Filter feature to find your module, and then click on the module in the list below

Step 7:

Under Details, select the Position where you want the module displayed and set the Status to Published

Step 8:

Under Menu Assignment, select which pages to show the module on. You can do this by either setting Module assignment to On all Pages, or by individually clicking on each page in the list below

Step 9:

Under Basic Options, configure any settings specific for this module

Step 10:

Click Save & Close