We highly recommend using Adium with Olark as it lets you log in using multiple screen names simultaneously, separating business and personal chats for example.
Download Adium
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Launch Adium and enter Preferences from the Adium menu options.

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Select the Accounts tab.

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Click on the + icon to add your Olark account. Depending on your version of Adium, choose either Jabber or XMPP from the drop down menu.
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Fill in the Jabber ID field with your Olark username, including @olark.com, as in the screenshot below. Enter your Olark operator password. Click OK. Do NOT click Register New Account.

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Select Available in the status menu to bring your Olark account online.
