On Accounting > Transactions add a journal transaction.
You should add a debit entry for the account "Owner's Equity" (drawings) and a credit for the same amount on the payment type you use to pay yourself, Cash, Bank Account etc
My follow-up is slightly more complicated. My wife and I have a part-time business as joint owners. We rarely 'take money out' as drawings, but when we do, we want to describe which of us has pocketed the cash. A journal entry "Bank" to "Owner's Equity" isn't achieving this.
If it helps, we have two cash accounts set up in Wave, one for each of us, as we often buy bits and pieces for the business from our own pockets.
My guess is we should transfer from Bank to personal cash accounts, then draw from those. However, if the cash account is sufficiently in credit, I guess there is no actual drawing?