To stitch photos into a panorama, you need a software that can handle panoramic image synthesis and manipulation. There are many options available, such as Photoshop, Lightroom, Hugin, PTGui, or Autopano. The exact steps may vary depending on the software you use, but the general process is similar. First, you need to import your photos and select the option to create a panorama. The software will analyze the photos and find the matching points between them. Then, it will align and warp the photos to create a seamless transition. You can choose different projection modes, such as cylindrical, spherical, or rectilinear, depending on the shape and size of your panorama. You can also adjust the cropping, rotation, and perspective of your panorama. Next, the software will blend the photos and merge them into one image. You can choose different blending modes, such as average, linear, or multi-band, depending on the quality and consistency of your photos. You can also fine-tune the exposure, contrast, and color of your panorama. Finally, you can export your panorama as a JPEG, TIFF, or RAW file, and save it to your computer or share it online.