The source network is matching your currently connected Metamask network, i.e. BSC.
The destination network may be "Polygon" by default: change it to "Ethereum":
Before
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Click if it shows "Polygon"
And select "Ethereum"
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After
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Select the source token
Either type "UNCL" in the search field, or select it if it shows in the list of your bridgeable tokens with a balance.
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Your screen should look like this
Warnings
Do go through the warnings before swapping:
Note that the "Maximum Crosschain Fee" is an unlikely scenario and what you see on your screen (i.e. 47.6 UNCL) is what should be minted then sent to your Ethereum address.
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Swapping
You will have to approve the UNCL spending and then use the swap button.
During the swap, follow the on-screen instructions.
Generated Transactions' links will be showing during the process.