No, you don't. There is no need to create a new Qredo account for self-custody.
By clicking + Yourself, you are adding yourself as an Approver to that Fund/wallet. This means that you'll also get an approval request, just like any other Approver within that Fund.
Note that you should be careful when selecting the Fund's/wallet's threshold, too. If all Approvers are needed to meet the threshold, losing a single account will render that Fund/wallet unusable.