Configure Workflow Manager on a server that is part of the SharePoint 2013 farm

To configure Workflow Manager on a server that is part of the SharePoint 2013 farm and on which communication takes place by using HTTP

1. Log on to the computer in the SharePoint Server 2013 farm where Workflow Manager was installed.

2. Open the SharePoint Management Shell as an administrator. This is accomplished by right-clicking the SharePoint 2013 Management Shell and choosing Run as administrator.

3. Run the Register-SPWorkflowService cmdlet.

Register-SPWorkflowService -SPSite "http://myserver/mysitecollection" -WorkflowHostUri "http://workflow.example.com:12291" -AllowOAuthHttp

4. Log on to each server in the SharePoint Server 2013 farm. Each server in the SharePoint Server 2013 farm must have the Workflow Manager Client installed.

5. Install the Workflow Manager Client on each server in the SharePoint farm.

To configure Workflow Manager on a server that is part of the SharePoint 2013 farm and on which communication takes place by using HTTPS

1. Determine if you need to install Workflow Manager certificates in SharePoint.

2. Log into the computer in the SharePoint Server 2013 farm where Workflow Manager was installed.

3. Open the SharePoint Management Shell as an administrator. This is accomplished by right-clicking the SharePoint 2013 Management Shell and choosing Run as administrator.

4. Run the Register-SPWorkflowService cmdlet.

Register-SPWorkflowService -SPSite "https://myserver/mysitecollection" -WorkflowHostUri "https://workflow.example.com:12290"

5. Log on to each server in the SharePoint Server 2013 farm. Each server in the SharePoint Server 2013 farm must have the Workflow Manager Client installed.

6. Install the Workflow Manager Client on each server in the SharePoint farm.

For downloading and installing the Workflow Manager Client go here

Reference