You can edit and add effects to HDR/32‑bpc images using any of the following Photoshop tools: Brush, Pencil, Pen, Shape, Clone Stamp, Pattern Stamp, Eraser, Gradient, Blur, Sharpen, Smudge, and History Brush. You can also use the Text tool to add 32‑bpc text layers to an HDR image.
When editing or painting on HDR images, you can preview your work at different exposure settings using either the 32‑Bit Exposure slider in the document info area or the 32‑Bit Preview Options dialog box (View > 32‑Bit Preview Options). The HDR Color Picker also lets you preview your selected foreground color at different intensity settings, to match different exposure settings in an HDR image.