diff --git a/src/actions/nostr.ts b/src/actions/nostr.ts
index d82fa49f4..6908f06b6 100644
--- a/src/actions/nostr.ts
+++ b/src/actions/nostr.ts
@@ -23,4 +23,4 @@ function nostrExtensionLogIn() {
   };
 }
 
-export { nostrExtensionLogIn };
\ No newline at end of file
+export { logInNostr, nostrExtensionLogIn };
\ No newline at end of file
diff --git a/src/features/ui/components/modals/nostr-login-modal/steps/key-add-step.tsx b/src/features/ui/components/modals/nostr-login-modal/steps/key-add-step.tsx
index 15b20dcb0..9153d4966 100644
--- a/src/features/ui/components/modals/nostr-login-modal/steps/key-add-step.tsx
+++ b/src/features/ui/components/modals/nostr-login-modal/steps/key-add-step.tsx
@@ -2,9 +2,11 @@ import { nip19 } from 'nostr-tools';
 import React, { useState } from 'react';
 import { FormattedMessage } from 'react-intl';
 
+import { logInNostr } from 'soapbox/actions/nostr';
 import EmojiGraphic from 'soapbox/components/emoji-graphic';
 import { Button, Stack, Modal, Input, FormGroup, Form } from 'soapbox/components/ui';
 import { NKeys } from 'soapbox/features/nostr/keys';
+import { useAppDispatch } from 'soapbox/hooks';
 
 import NostrExtensionIndicator from '../components/nostr-extension-indicator';
 
@@ -16,18 +18,22 @@ const KeyAddStep: React.FC<IKeyAddStep> = ({ onClose }) => {
   const [nsec, setNsec] = useState('');
   const [error, setError] = useState<string | undefined>();
 
+  const dispatch = useAppDispatch();
+
   const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
     setNsec(e.target.value);
     setError(undefined);
   };
 
-  const handleSubmit = () => {
+  const handleSubmit = async () => {
     try {
       const result = nip19.decode(nsec);
       if (result.type === 'nsec') {
         const seckey = result.data;
-        NKeys.add(seckey);
-        // TODO: log in, close modal
+        const signer = NKeys.add(seckey);
+        const pubkey = await signer.getPublicKey();
+        dispatch(logInNostr(pubkey));
+        onClose();
       }
     } catch (e) {
       setError('Invalid nsec');
@@ -52,7 +58,7 @@ const KeyAddStep: React.FC<IKeyAddStep> = ({ onClose }) => {
               />
             </FormGroup>
 
-            <Button theme='accent' size='lg' type='submit'>
+            <Button theme='accent' size='lg' type='submit' disabled={!nsec}>
               Add Key
             </Button>
           </Stack>