How can I transfer monies from a Roth IRA account to other investments like mutual funds?

taking money from an IRA and letting it make money and grow in other investments.

A Roth IRA (or a Traditional IRA) can invest in many things; there are a few that are not permitted. Mutual funds are one of the most widely held IRA investments.

If your trustee, the institution that holds the IRA account and makes the investments for you, doesn't have a wide selection of mutual funds, you can make a transfer of part or all of your account to an institution that does. For tax reasons, you don't want to take the money into your own account; if you do a transfer, have it arranged by the institution receiving the funds.

For example, large mutual fund families, like Vanguard and Fidelity, are trustees for many IRA accounts, and you can contact them to arrange an institution-to-institution transfer.

Or stockbrokers like Charles Schwab & Co. can hold IRA accounts, and they allow you to invest in a wide variety of mutual funds of many fund families.

In general, you don't have to take money out of your IRA to invest in mutual funds. Instead, have the IRA money transferred to an institution (like Schwab, Fidelity, Vanguard) that will buy mutual funds for you, in your IRA. If you don't remove the money from the IRA, it continues to grow free of tax on the income and gains.

An IRA is only a holding account (it is not a vehicle to actually invest in). Once you have put money in your IRA, you still have to invest in stocks, bonds, cash holdings, or mutual funds. You don't need to take money out to accomplish this. Taking money out of an IRA would seriously hurt your investing because of the taxes you would have to pay. An IRA is the shoe box, not the shoe (mutual funds).

The other answers are great but when looking to transfer your account make sure you understand the fees associated with the institution that holds the account for you.12-b1 fees are marketing fees(they charge you for advertising to other people!!!). Load fees etc. are all quoted as a %, the lower the better. If a company charges 1% for their fees, add that to inflation and you need the fund to return at least 4.5% to break even. Vanguard has cheap fees in their index funds.