Add Alternative setup method to getting-started-formbox.md

Author: alex-serednev

docs/modules/aidbox-forms/getting-started-formbox.md

@@ -43,3 +43,49 @@ More about Aidbox licenses [here](../../overview/aidbox-user-portal/licenses.md)
 Press the button `Forms` in the console in browser (or by visiting [http://localhost:8080/ui/sdc](http://localhost:8080/ui/sdc))
 
 See [Design form in Aidbox UI Builder](aidbox-ui-builder-alpha/)
+
+
+## Alternative setup via Aidbox Portal
+
+You can also start Formbox standalone from the Aidbox Portal and then sign in with the credentials generated for your instance.
+
+### 1. Open the Aidbox Portal
+
+Go to [Aidbox Portal](https://aidbox.app/ui/portal#/).
+
+Sign up for a new account or log in to an existing one.
+
+### 2. Create a Formbox license
+
+Click **New license** and fill in the following fields:
+
+- **Product**: `Formbox`
+- **License type**: choose the type you need
+- **License name**: enter a name for your license
+- **Hosting**:
+  - **Sandbox** — use Formbox in the cloud without Docker
+  - **Self-hosted** — run Formbox locally with Docker
+
+Click on **"Create"** button.
+
+If you choose **Sandbox**, wait until the page finishes loading. After that, the product will be ready to use.
+
+If you choose **Self-hosted**, the portal will show the next setup steps for local launch:
+
+After the license is created, you will be redirected to the **Product Summary** page.
+
+### 3. Run Formbox locally
+
+On the **Product Summary** page, copy the command from the **Run me locally** field and run it in your terminal.
+
+After the installation completes successfully, the output will show the local URL where Formbox is running ([http://localhost:8080/](http://localhost:8080) is used by default).
+
+### 4. Open Formbox in the browser
+
+Copy the local URL from the terminal output and open it in your browser.
+
+### 5. Sign in
+
+Enter the login and password shown on the **Product Summary** page.
+
+After a successful sign-in, use the left sidebar to open **Aidbox Forms** and continue working in Formbox.