Any personalizations on your order, including string colors, states, names, dates, etc. can be left in the notes box during checkout. This is a text box you can type in before completing your order.
If you happen to forget or miss that box during checkout, you may send me a message via Etsy regarding your order and I am happy to connect the details to your order.
If I am ever unclear of the details for your order, I will reach out to you to clarify. The exception to this is when no string color is indicated, when in the item description I have indicated that the default string color is white.