Make sure the Clipbin you want to add your clip(s) to is Active. If it is Active, it will be highlighted in bold. If you have multiple Clipbins, you can make another Clipbin active by going to the gear icon on the Clipbin and selecting "Make Active".

Once your clipbin is active, to add a clip, you can click on the "add" icon on the clip itself. 

 

Or if you have multiple clips, you can select the clips you wish to add to your active Clipbin  (hover your mouse over the clip thumbnail and click the empty checkbox that appears in the upper right hand corner of the thumbnail), then under the Actions menu at the top right hand corner of the web page, select the "Add Selected to Active Clipbin" option. 

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You can also drag-and-drop individual clips or a batch of selected clips into the Active Clipbin.

To remove a clip, simply hover your mouse over the clip thumbnail and click on the "Remove" icon that appears on the clip itself. 

If you have multiple clips you would like to remove, select the clips and then under the Actions menu at the top right hand corner of the web page, choose the "Remove Selected From Current Clipbin" option. 

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You can also drag-and-drop clips out of the Active clipbin from the Cart & Clipbin panel.  Simply click and hold the thumbnail image of the clip you would like to remove, and then drag it out of the Active Clipbin.