There is a different form for each type of membership, select the type you want and use the appropriate link below in the following way.
To view the form in your browser simply click on the link and it will open on a new tab. Your browser will allow you to adjust the size of the image, probably by hovering near the bottom centre of your browser screen you will see some controls - + and - will change the size of the document, the printer icon will allow you to print the form, the disk icon will allow you to save the form to your computer.
To download the form directly to your computer right-click on the link and select "Save target as" from the list that appears.
To apply for full membership of the Society use this link - Membership Form
To become a supporter of the Society use this link - Supporters Form