i have the daedalus wallet and want to withdraw from one address only. How can i realize this, i don't see a coin control feature? i even cannot see how to extract the private keys. Can anybody give me a hint?
The current version does not have such a coin control feature. Daedalus picks the UTXO automatically based on clever rules to prevent a lot of change and to avoid dust. But you can suggest a feature through the wallet UI if you like to.
Daedalus also does not allow you to extract the private keys in a convenient way. (that said I'm sure there are some hacky ways to decrypt the keyfile with your spending password and go from there)