How do you operate an OV-Chipkaart Automaat?

According to this site of the public transport company in the Hague, there are three kinds of machines to charge your OV chip card.
Two of them work with cash, bank cards (debit cards from banks in the Netherlands although others may work) and credit cards (which should accept most or all cards.) The third kind only works with bank cards, which is likely the one the OP wants to get instructions for.

As only Dutch bank cards work, they may not include instructions in other languages. While the Netherlands is a country where we speak English as a rule, it is not our own language and some services may not be rolled out in multiple languages.
If you can not use the machines near your house or hotel, best not let your credit drop below the critical limit. (€4 for bus rides, €20 for train travel) And use the machines where you know you can get them to work.

If you are stuck, the best way to work such a machine is to ask a local to help you out. Offer them cash money and ask them to do the deal in Dutch, with their own bank card. Not all will but there is a decent chance you find someone to do it for you. For a long term resident, with a Dutch bank account, it might be easiest to learn to read enough Dutch to follow the instructions.

Or you can go for automated charging your card, in which case it will never get below a given amount. You can select that (from standard choices) and re-set it if your experience tell you that you need it higher or lower.

(For those people who complain about there being no English on Dutch machines, I still have to find the first machine in the UK let alone the USA or Australia with an option for Dutch.)