The use of sign “TM” or “R” has specific significance, so one should use it very precisely. “TM” signs signify that the user is the true owner of the brand and it is in the procedure of registration under the Trademark Act. However there is no legal meaning for “TM” sign. “R” sign signifies that the user is the registered owner of the brand.
If you are not the registered user then one should not use “R” sign. Using such sign defines common people that your company is the real owner which increases the authenticity of the product.