How do I delete signature from "Sign yourself" - Delete buttons are greyed out

[chenmingyi]

Hi, please see attached image. I'm trying to replace the signatures but it seems that the delete buttons are greyed out for both. Kindly advise.

[joefreshy]

Sadly, you are a victim of 'greyed out', an affliction that has claimed many who seek help in 'the halls of the plagued'. 

Adverse effects may include; high blood pressure, rage, violent outbursts, self harm. 

It is recommended you cease using adobe products as continued use is detrimental to your health. 

Note; Masks will not protect you from 'greyed out'.