Launch the app, click 'Open' or drag your PDF into the interface. Use the in-built viewer with zoom, search, and bookmark options for easy navigation.

Yes, select the 'Edit' tool, then click on text areas to modify content directly. Access via the toolbar's 'Edit' button for seamless editing.

Use the 'Annotation' tools on the toolbar to highlight, underline, or add comments. Select the desired annotation type and click on your PDF.

Go to 'Merge & Split' feature, select multiple files or pages, then click 'Merge' to combine into a single PDF.

Select the 'Text Extraction' tool, choose your pages or sections, then click 'Extract'. You can copy the text or save it separately.

Open your PDF, click 'Digital Signature', then follow prompts to sign with a saved certificate or create a new signature.

The app offers a free version with basic features. Advanced tools may require a subscription, which can be managed via Settings > Account > Subscriptions.

Navigate to Settings > Account > Subscriptions to view or upgrade your plan and manage billing information.

Try restarting your device, ensure your app is updated from the Windows Store, or contact support through 'Help > Support' for assistance.