How do I list down my cash (e.g. physical notes and coins)?

If you are referring to cash in bank, you can list it under bank account accordingly.

If you are referring to the physical notes and coins, people generally do not list them as it is insignificant. This will then be distributed based on the Allocate Residual Assets section. However, if the client wants to or if the sum is significant [there's no quantitative measure on this unfortunately] such as "secret money kept in a stash somewhere", you can list the physical notes and cash under other assets.