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Himanshu Patel 55Himanshu Patel 55 

Difficulty in understanding visual force page

Hello, I am seeking for help in changing URL from one application to another. 

Currently we have SSO implemented from Community portal by clicking on LOGIN button in one of page where user is directed to another application. Below is line where i want to update URL <a href="{!wmURL} . How can i find this URL in salesforce

<p><a href="{!wmURL}" target="_blank" class="btn btn-primary">{!$Label.lbl_vetPortal_WeightManagementLogin} &rarr;</a></p> 

2) I have one of existing tab in salesforce which i want to call when click on LOGIN button. Please advice how to accomplish this. 

Thanks for you help in advance.