We need to step up the toad tool in the client machine and configure the database.
Before Installing and configuring the TOAD, Database client must to installed in the machine.
After installation of the software on PC or citrix using below mentioned steps.
Connect to the system as an administrator.
Copy the Toad installer to the Citrix/Remote Desktop Services server, if required.
Install Toad according to the instructions provided in this guide.
Right-click the Toad.exe file in the root installation folder, and then select Properties. Make sure the Allow non-administrators to run this program option is selected under Compatibility | User Account Privileges.
Repeat these steps for each server in the Citrix/Remote Desktop Services farm.
Now add the tns entries of the databases you want to connect in the $ORACLE_HOME/network/admin location in the tnsnames.ora file.
After adding the tns entries, open the Toad and in go to New connection and in the pop window, enter the schema name you wanted connect and password then select the tns from the dropdown list and click on connect.
Import User Settings
If you are installing a new version of Toad on the same computer where a previous Toad version is installed, Toad automatically imports your settings if the new version is within two releases of the previous version. If your versions are more than two releases apart, you need to install an intermediate version to successfully import the files, and then upgrade to this version.
If your old settings are not located on the same computer as the one where you are installing this version of Toad, use the following procedure to import them.
To import settings from another computer
You need your license key to complete these steps.
On your old computer, open Windows Explorer and locate the Toad settings folder.
Note: To find the settings folder, select View | Toad Options | General. The folder location is listed in the Application data directory field.
Copy the folder to the new computer, a network it can connect to, or a storage device.
Install and open Toad on the new computer.
Select Utilities | Copy User Settings in the main Toad toolbar.
Click ... then navigate to the copied folder.
Note: You can also select Utilities | Copy User Settings, then select Create a clean set of user files from the base installation.