UX: Add Custom Token More Obvious

[uxandyphil]

Describe the bug
As a user that comes to clove.lamden.io, I have no idea there is a way to add a custom token. The only way I realize this is by clicking "Please select currency" and then a "Add Custom Token" button displays in a very unintuitive way.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://clove.lamden.io

Expected behavior
I would expect "Add Custom Token" to display at all times (as my screenshot shows).

Screenshots
Like this:

Not like this:

Especially not like this:

Desktop (please complete the following information):

• OS: macOS High Sierra 10.13.6
• Browser: Safari
• Version: 12

Additional context
N/A