Danke für die Antwort, vor allem für den Tipp mit dem Überweisen. Das hilft ja vielleicht auch anderen Newbies (mein Problem habe ich inzwischen gelöst, wobei ich nicht mehr weiß, wie... Wie sieht der Präfix für die Keys denn aus? hast du ein Beispiel dafür?

Yes, I'm sure that I have bitcoins in that blockchain-account and it's not watch only, because I have already received and sent money from there.

But I thanks for putting me in the right direction: The address where I got the BTCs  in my Blockchain-Account is an "imported address", as I got my BTC in another wallet before. Could that be part of the problem?

UPDATE: Thats it, thanks! I transferred the BTC form the "imported address" into my wallet. And there they are in Electron. Great! Can I delete my Blockchain-Wallet no without loosing the BTC in my Electrum-Wallet?

I did exactly that (with Electron 3.0). I enter my seed, no error, and then Electron opens the wallet and... nothing happens. My balance is 0 BTC. Do I have to wait, till it imports my bitcoins? (The network is green)

Ah, I think I know what you mean. I installed a new Electron version and at the start the app asks me about my recovery phrase and I can click the options button and the BIP39-Seed box. But even if I enter my Blockchain-recovery phrase here, my bitcoin address is not imported. But know I cannot import a private key anymore, the option ist just missing in the electrum-menu.

Thanks for your quick answers. I just copied and pasted my private key from my Blackchain-Account (in the base58-format), but you are right the address that is added to my Electrum-Wallet is not mine.

Where should I click the options-Button? In Electrum?

I am a bitcoin newbie and first got a wallet at bitcoin.info. I would like now to import my wallet to Electrum (Mac), but it doesn't work.

I followed these instructions (which are obviously a bit dated). https://bitcointalk.org/index.php?topic=594570.0

I copied my private key at Blockhain and added it via "Import private keys" at Electrum in a new wallet. Under "Addresses" there is now a new Bitcoin address with this key. But my Bitcoin account in Electrum is still empty, the import probably did not work. (The network is green, so that seems to be correct).

Does anyone have an idea what went wrong?

Ich bin ein Bitcoin-Newbie und hab mir zuerst ein Wallet bei bitcoin.info geholt. Ich würde mein Wallet jetzt aber gerne nach Electrum (Mac) importieren, nur klappt das nicht.

Ich habe mich an diese Anleitung gehalten (die offensichtlich etwas veraltet ist). https://bitcointalk.org/index.php?topic=594570.0

Ich hab beim Blockhain meinen privaten Key kopiert und über "Import private keys" bei Electrum in einem neuen Wallet auch hinzugefügt, unter "Adressen" steht jetzt eine neue Bitcoin-Adresse mit diesem key. Aber mein Bitcoin-Konto in Electrum ist weiterhin leer, d.h, der Import hat wohl nicht geklappt. (Das Network ist grün, das scheint also auch zu stimmen).

Hat jemand eine Idee, was das falsch gelaufen ist?